2011 Honda CBR250R makes 25 Bhp at the wheel with a free flow muffler and ECU remap!

2011 Honda CBR250R Silver

Power at the crank and power at the wheel are two different things. While we won’t get into that right now, what really matters to you, the rider, is how much power your motorcycle makes at the wheel. The folks in Thailand got the 2011 Honda CBR250R much before us and ever since, they’ve already began exploring ways on how to make the already quick motorcycle quicker.

If you notice, the 2011 Honda CBR250R has an extremely ungainly muffler that looks like an a darn traffic cone stuck on to it. Not nice at all. Also, since the catalytic converter sits there, it is pretty heavy too. So, there are a bunch of enterprising folks in Thailand who’ve already began designing and manufacturing bolt on mufflers, which are lighter and free flowing.

So, adding a performance muffler to Honda CBR250R gives you a power bump of almost 10% throughout the rev range, even as it makes the motorcycle sound like, well a throaty motorcycle. So, you go faster as well as might end up saving some money at the fuel pump as more torque means lesser gear changes while trundling around, leading to higher fuel economy.

2011 CBR250R Dyno Performance Figures

Here are a few figures. A 2011 Honda CBR250R on the dyno produced about 22.25 Bhp and 19.72 Nm at the wheel. With a free flow muffler, this figure rose to 23.72 Bhp and 22.22 Nm at the rear wheel. Adding a power commander ECU remap, the power figure went up to 24.5 Bhp with the torque at 21.68 Nm.

So, just a simple swap of the exhaust costing about INR 12.5 Thousand produced 1.5 Bhp of power over the stock version and 2.5 Nm or torque over the stock bike. Word around the Thai forums say that the PGM-FI fuel injection system of the CBR250R can easily handle the addition of a free flow exhaust although it remains to be verified scientifically.

A better option of course would be to add an after market remapped ECU like the ones made by Power Commander to the CBR250R along with a high flow replacement air filter. This, as changes to the exhaust might result in the engine running leaner than optimum in certain conditions where the stock ECU’s design does not cope with.

All said, the performance bump up options for the Honda CBR250R looks very promising indeed and the coming days will only produce more options for the gearheads amongst you as the CBR250R is a global model and will get launched in other markets apart from India and Thailand.

Via AzizyHoree

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April 12, 2011 | By Jay Prashanth · Tags:

Comments

5 Responses to “2011 Honda CBR250R makes 25 Bhp at the wheel with a free flow muffler and ECU remap!”

arjun on April 12th, 2011 8:11 pm

the indian specs say that a stock cbr250 churns out
25bhp and has a torque of 22.9 Nm

http://www.honda2wheelersindia.com/cbr250r/specifications.html
Jay Prashanth on April 12th, 2011 8:18 pm

Arjun,

You must understand that manufacturers quote power and torque figures at the crank and not at the wheel. Due to transmission losses, the power at the wheel is always at least 10% lesser than that at the crank. Hence, the stock CBR250R will not produce more than 22 Bhp at the wheel. In fact, American dyno tests show a figure of about 21.5 Bhp for the CBR250R.

Cheers,

Jay
harsh on April 13th, 2011 4:19 pm

Friends,

it is not a point to discuss that its power is more or less but after all it gives a miraculous pick-up.I think it should be the bike of the year.
Ankur Jain on April 28th, 2011 5:23 pm

Hi Guys,
How is the Fuel Efficiency affected with power bumped up. I have a normal impression that “more the power lesser the Fuel Efficiency” . How much is the Fe of CBR250R as claimed by company for indian version ? I am thinking about booking this bike after taking the test ride.

-AJ
Jay Prashanth on April 28th, 2011 6:05 pm

Ankur,

The CBR250R might deliver about 30 KMPL if ridden normally. About your impression about more the power, less the fuel efficiency is right to a certain extent but fuel efficiency mainly depends on the volumetric efficiency of an engine. For example, just as modern engines are getting more powerful, they are also getting fuel efficient as well.

Cheers,

Jay